I've been searching online for a few days to find a decent (and affordable) 50W heater for my 5g. My roommate likes to keep the windows open at night, and our room gets SUPER cold...which does not agree well with my poor fish.

Anyway, the reviews I've read on almost every heater have been pretty mixes- so I thought I'd ask the experts!

What do you all suggest? Also, I really can't afford to spend more than $20...so that poses a bit of a problem.